*{
    margin: 0;
    padding: 0;
}
.pd20{
    padding: 0 20px;
}
.head-ul{
    height: 45px;
    display: flex;
    border-bottom: 1px solid #ccc;
    background-color: #ebe8e8;
}
.head-ul .head-li{
    line-height: 45px;
    font-size: 16px;
    width: 100px;
    text-align: center;
}
.head-ul .head-li+.head-li{
    margin-left: 10px;
}
.content{
    height: calc(100vh - 246px);
}
.footer{
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    background-color: black;
    color: #fff;
}